EP0943034B2 - Verfahren zur trocknung von papier und trockenpartie einer papiermaschine - Google Patents

Verfahren zur trocknung von papier und trockenpartie einer papiermaschine Download PDF

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Publication number
EP0943034B2
EP0943034B2 EP97946772A EP97946772A EP0943034B2 EP 0943034 B2 EP0943034 B2 EP 0943034B2 EP 97946772 A EP97946772 A EP 97946772A EP 97946772 A EP97946772 A EP 97946772A EP 0943034 B2 EP0943034 B2 EP 0943034B2
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European Patent Office
Prior art keywords
dryer
paper web
curling
paper
section
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EP97946772A
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English (en)
French (fr)
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EP0943034B1 (de
EP0943034A1 (de
Inventor
Pasi Ahonen
Jaakko Kallioniemi
Juha Kaihovirta
Ville Korhonen
Matti Luontama
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Metso Paper Oy
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Metso Paper Oy
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper

Definitions

  • the invention concerns a method for drying of paper, which method comprises the following steps:
  • the invention also concerns a dry end of a paper machine, which comprises a forward dryer section and a finishing section, which finishing section comprises a coating/surface-sizing equipment, an after-dryer, a calender, and a reeling station, and the dry end of the paper machine further comprises elements and/or assemblies and combinations formed out of said elements and at least one steam box in view of controlling the curling of the paper web at least in the area of the finishing section.
  • twin-wire draw and/or single-wire draw is/are employed.
  • twin-wire draw the groups of drying cylinders comprise two wires, which press the web one from above and the other one from below against heated cylinder faces. Between the rows of drying cylinders, which are usually horizontal rows, the web has free and unsupported draws, which are susceptible of fluttering, which may cause web breaks, in particular so when the web is still relatively moist and, therefore, of low strength.
  • each group of drying cylinders includes just one drying wire, on whose support the web runs through the whole group so that the drying wire presses the web on the drying cylinders against the heated cylinder faces, whereas on the reversing cylinders or rolls between the drying cylinders the web remains at the side of the outside curve.
  • the drying cylinders are placed outside the wire loop, and the reversing cylinders or rolls inside said loop.
  • the tendency of curling of paper is already affected in connection with the web formation, in particular at the sheet formation stage (for example, the applicant's Sym-FormerTM) by means of selection of the difference in speed between the slice jet and the wire, and by means of other running parameters.
  • the sheet formation stage for example, the applicant's Sym-FormerTM
  • a suitable initial curl form is regulated for the sheet in order that the curling of the paper after one-sided or double-sided copying could be optimized.
  • the reactivity of curling i.e. the extent to which curling occurs per unit of change in moisture content, is affected to a greater extent by means of a multi-layer structure of the paper, which is produced in connection with the web formation in the wet end.
  • the object of the present invention is to provide a dry end of a paper machine in which no inverted groups are needed at all, but which, however, meets all other requirements that are imposed.
  • the object of the present invention is to approach these problems from a new point of view and to suggest novel solutions for said problems, which solutions are contrary to conventional modes of thinking.
  • a method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine as well as a dryer section of a paper machine for applying the method, wherein, in view of compensating for a tendency of curling of the paper web, in the after-dryer the paper web is dried in a dryer group/groups making use of a normal single-wire draw, and that, in connection with or after the drying, the paper web is treated by means of a device/devices in order to compensate for a tendency of curling of the paper web, which devices are, for example, a steam box, a blower unit, a moistening device, and/or a soft calender.
  • devices are, for example, a steam box, a blower unit, a moistening device, and/or a soft calender.
  • FI Patent Application No. 963024 a method for drying a paper to be surface-treated, in particular fine paper, in an after-dryer in a paper machine is described as well as an after-dryer in a paper machine for carrying out the method, wherein, after the surface-sizing or coating, the paper web is dried by means of an upwards open inverted group with single-wire draw, in which connection the tendency of curling formed in the paper web in the forward dryer section can be substantially eliminated and/or compensated for.
  • the object of the present invention is further development of the earlier solutions described above so that the curling of the paper can be controlled more efficiently in the dry end of the paper machine.
  • the dry end of a paper machine in accordance with the invention is mainly characterized in that the effect of said steam box is intensified by cooling the web prior to said steam box.
  • the forward dryer section in the dry end of the paper machine is exclusively based on dryer groups with single-wire draw, in which case the removal of broke takes place all the time by the force of gravity and does, thus, not cause problems.
  • the single-wire draw in the forward dryer section the paper web is constantly supported by a wire, whereby the runnability is improved and it is possible to increase the running speed.
  • both the forward dryer section and the after-dryer have been accomplished exclusively by means of dryer groups with normal single-wire draw.
  • blowing through the wire is employed for regulating the curling; from above the different cylinders hot air is blown out of impingement blow devices, and evaporation takes place through the wire and affects the drying and, thus, the curling of the paper.
  • steam boxes and possibly blowings of moist air taken from the forward dryer section are employed for controlling the curling.
  • a lower support belt has also been added to a dryer group, which belt circulates against the lower faces of the reversing rolls while guided by its own guide rolls, and which support belt is so impermeable that it prevents evaporation of water out of the web from its lower face, whereby the tendency of curling can be controlled.
  • the forward dryer section has been accomplished exclusively by means of dryer groups with single-wire draw, to which groups, where applicable, impingement blow equipments have been added for regulation of the curling and, if necessary, also in order to increase the capacity.
  • the after-dryer has been accomplished so that it includes both dryer groups with single-wire draw and those with twin-wire draw, the curling being controlled by means of the dryer groups with twin-wire draw.
  • impingement blow equipments can also be added to the groups with single-wire draw in the after-dryer.
  • the forward dryer section is exclusively composed of dryer groups with single-wire draw, as is the after-dryer, in the after-dryer, in order to control the curling
  • a higher ratio of the diameter of a drying cylinder to the diameter of a reversing roll has been used than in the forward dryer section, in which case a more equal evaporation is obtained from the top side and from the bottom side.
  • the dryer group it is possible to use airborne type hoods fitted in connection with the reversing cylinders in order to increase the capacity and/or to compensate for the curling, both in the after-dryer and in the forward dryer.
  • an additional steam box in view of controlling the curling.
  • moist air or any other, equivalent medium such as a device that blows moist air that is brought from the forward dryer, or, for example, a separate water atomizing box, by whose means water is sprayed by means of air as small drops towards the web, or an airborne type hood to be placed underneath.
  • a what is called "spreader bar" at one side or both sides of the paper web in order to work the curling of the paper web mechanically. In this way in particular the curling of the web in the longitudinal direction is affected.
  • the spreader bar can also be of a spreader roll type, in which case the effect on cross-direction curling can be enhanced.
  • FIGS 1 to 4 are schematic illustrations of the dry end of the paper machine which is shown from the forward dryer up to the machine reel-up.
  • Figure 5 is a schematic illustration of in part of the after-dryer of a paper machine.
  • Figure 6A is schematic illustration of an exemplifying embodiment of the invention, in which figure the last dryer group in the after-dryer and the machine reel-up are shown.
  • Figures 6B to 6E are schematic illustrations in which figures the dry end of a paper machine is shown from the forward dryer section to the machine reel-up.
  • the paper web W is brought into the forward dryer section D1 from the press section onto the drying wire 15 of the first group R 0 with single-wire draw, to which wire the web is attached by the effect of the vacuum in the suction boxes 13.
  • the forward dryer section includes 7 groups R 0 ...r 6 with single-wire draw, and the web W has closed draws over the group gaps between said groups.
  • the machine direction i.e. the direction of progress of the of the web W is denoted with the arrow S.
  • all the groups R 0 ...R N with single-wire draw are so-called normal groups, in which the, for example, steam-heated smooth-faced drying cylinders 10 are placed in the upper horizontal row and the reversing suction cylinders 11 are placed in the lower horizontal row.
  • Each normal group R 0 ...R N has a drying wire 15 of its own, which is guided by the guide rolls 18.
  • the drying wires 15 press the web W to be dried on the drying cylinders 10 against the smooth heated faces of the cylinders, and on the reversing cylinders 11 the web W remains at the side of the outside curve on the outside face of the wire 15.
  • the web W is kept reliably on the support of the wire 15 against the effect of centrifugal forces by the effect of the vacuum present on the grooved faces 12 of the reversing cylinders 11 or on the perforated mantle of an equivalent suction roll, whereby cross-direction shrinkage of the web W is also counteracted.
  • suction cylinders 11 particularly favourably are used the suction cylinders which are marketed by the applicant with the trade mark "VAC-ROLL”TM and which have no inside suction boxes, and with respect to the details of the constructions of said suction cylinders reference is made to the applicant's FI Patent No. 83,680 (equivalent to US Pats. Nos. 5,022,163 and 5,172,491 ).
  • a forward dryer D1 the support contact between the web W and the drying wire 15 is kept adequate also on the straight draws between the drying cylinders 10 and the reversing cylinders 11 by, at least on the runs from the drying cylinders 10 to the reversing cylinders 11, making use of blow-suction boxes 17, by means of which boxes formation of pressures induced by the wire 15 is also prevented in the closing wedge-shaped nip spaces between the wire 15 and the cylinder 11 mantles.
  • Blow-suction boxes 17 are understood as blow boxes whose air blowing produces a vacuum, and said boxes 17 do not communicate with sources of vacuum.
  • blow-suction boxes 17 which are marketed by the applicant with the trade mark "UNO RUN BLOW BOX”TM
  • Blow-box solutions of other types, in themselves known, are also included in the scope of the overall concept of the present invention.
  • blow boxes 16 are also employed in the gaps between the reversing cylinders 11, by means of which boxes 16 said gap spaces are air-conditioned and evaporation from the web W is promoted.
  • the faces of the drying cylinders 10 are kept clean by doctors 14.
  • suction zone should preferably be extended over an area wider than the turning sector of the drying wire 15 and the web, so that the suction effect and the free flow of air can be extended into said wedge spaces, for the purposes mentioned above.
  • the dry end of a paper machine in accordance with the invention includes a finishing unit D2 placed after the forward dryer D1, which finishing unit includes a machine reel-up 50, for example a Pope-type reel-up.
  • a machine reel that is being produced on-line by means of the reel-up 50 is denoted with the reference MR 0
  • one complete machine reel is denoted with the reference MR.
  • the web W is brought to the machine reel-up 50 through the calender 40 from an after-dryer 30, which is placed after the coating device 20 in the finishing section D 2 .
  • the paper web W which has been dried to a dry solids content of k 2 ⁇ 96...99 %, is passed over paper guide rolls 25 and over a measurement beam 26, which is placed between said guide rolls 25 and which measures the property profiles of the paper, into a coating device 20, which is, for example, a coating device marketed by the applicant with the name Sym-SizerTM.
  • the coating device 20 includes two coating rolls 21 and 22 placed one opposite to the other, and size feed devices 23 and 24 are placed in connection with both of said rolls so that the paper web W is coated from both sides in the coating nip NS between the rolls 21 and 22.
  • the web W is partly moistened in the coating nip NS from both sides. Then, the web W, which was dried in the forward dryer D1 asymmetrically from the side of its bottom face W and which has a tendency of curling, is treated into such a state that its internal strains are partly relaxed or at least substantially reduced.
  • the forward dryer section D 1 is exclusively composed of dryer groups R 0 ...R 6 with single-wire draw; in which the paper web W runs meandering from a drying cylinder 10 onto a reversing roll 11 and onto a drying cylinder 10 and so on.
  • the dryer groups R 0 ...R 6 in connection with some of the drying cylinders 10 in the groups, upper impingement blow equipments 19 have been fitted in order to regulate the curling, by means of which impingement blow equipments 19 hot air is blown towards the web W, and evaporation takes place through the wire 15 thus regulating the curling.
  • the after-dryer 30 in the finishing section D 2 is also exclusively composed of dryer groups R 21 ,R 22 ,R 23 with single-wire draw, in connection with which groups an option has been arranged for an impingement blow equipment 19A for possible requirement of additional regulation of curling.
  • the curling is controlled by means of steam boxes 31.
  • an infra dryer 32 has been fitted.
  • one steam box 31 has been fitted before the web W is passed to the calender 40.
  • Impingement drying can be used in the forward dryer section D 1 also for requirements of additional capacity, for example for increased running speed and for two-sided drying.
  • the blowings from the impingement blow devices 19 also affect the regulation of curling so that ventilation is provided in the web area, in which case the evaporation is less one-sided.
  • the wire 15 must be as open as possible, and when the web runs, for example, at a speed of 25 metres per second, the blow velocity of the blow air must be 25 to 150 metres per second, optimally about 100 metres per second.
  • the blow angle of the nozzles of the impingement blow devices 19 is chosen optimally based on the wire properties that are used, on the running speed of the machine, and on other parameters.
  • the blow air can be outdoor air or heated air, up to 400 °C, preferably of a temperature of 70...200 °C.
  • Fig. 2 the forward dryer section D 1 is similar to that shown in Fig. 1 , but here the after-dryer 30 is also provided with impingement blow devices 19.
  • a lower support belt 33 In connection with the last dryer group R 23 in the after-dryer 30 a lower support belt 33 has been arranged, by means of which belt evaporation of water out of the bottom face of the web W is prevented, whereby the curling is regulated.
  • the lower support belt 33 is a tight belt, which prevents removal of moisture through the bottom face, in which case the moisture is removed from the opposite side of the web W; thus, since the belt 33 prevents evaporation from the bottom face, the web W is curled towards the bottom face. It is a further advantage of the support belt 33 that here the web runs between two belts 33,15, in which case the web W is supported particularly well.
  • a support belt 33 When a support belt 33 is used, its guide rolls 33A are placed at a lower level, approximately at the same level as the bottom edges of the reversing cylinders, in which case the removal of broke is easy as the belt 33 operates as a broke conveyor at the same time.
  • the support belt 33 is preferably provided with a drive of its own, in which case its tension can be regulated as required.
  • the support belt 33 is preferably a dense wire, whose permeability is low, or a smooth-faced belt.
  • the temperature of the belt 33 can be adjusted, it can be cooled and/or heated as required when the curling is controlled. In this connection it is also favourably possible to introduce moist air into the area between the belt 33 and the reversing cylinders 11, whereby the process can be made more efficient.
  • the forward dryer section D 1 in Fig. 3 is similar to those shown in Figs. 1 and 2 , but here the last two dryer groups R 32 ,R 33 in the after-dryer 30 have been formed as dryer groups with twin-wire draw, by means of which groups, thus, the curling is regulated.
  • the dryer cylinders 10A, 10B are fitted in two rows, and the cylinders in each row have a wire circulation 15A, 15B of their own guided by the guide rolls 18A,18B, and between the rows the web W has free unsupported draws.
  • Impingement blow devices 19 have been fitted in the forward dryer section in connection with the drying cylinders 10 in the upper row in view of regulating the curling, increasing the capacity, and providing two-sided drying.
  • impingement blow equipments 19 have been provided additionally in connection with the first dryer group R 21 in the after-dryer.
  • the steam temperature in the cylinders 10 is rather low, in which case the impingement blow devices 19 also provide additional capacity for heating the web W.
  • the impingement blow devices 19 It is a particular advantage of the impingement blow devices 19, that their temperatures can be regulated quickly, in which case, for example, change of the machine from one paper grade to another is quicker, whereby additional production is achieved.
  • a larger ratio of diameter of drying cylinder to diameter of reversing roll (D syl /D tela in Fig. 5 ) is employed, compared with the forward dryer section D 1 , in which case a more uniform evaporation is provided at the top/bottom side, and thereby the curling can be controlled.
  • the after-dryer 30 in the finishing section D 2 is composed of two dryer groups R 21 ,R 22 with single-wire draw. In connection with the reversing rolls 11 in the latter group R 22 , steam boxes 31 have also been arranged in order to control the curling.
  • the after-dryer 30 as shown in Fig. 5 can be fitted in connection with the forward dryers D 1 illustrated in the figures described above.
  • the drying cylinders 10 have preferably adjustable steam pressures, and, if necessary, it is possible to use impingement blow devices 19 also in connection with these drying cylinders 10 in order to increase the capacity.
  • impingement blow devices 19 At the side of the reversing cylinders 11, if necessary, it is possible to provide additional moisture, for example, by bringing moist air from the forward dryer section D 1 , by using a water atomizing equipment, support belts, or equivalent arrangements that have been described above and will be described later.
  • a what is called spreader bar 34 has been fitted also in connection with the web, by means of which bar 34 the longitudinal curling of the web W is worked mechanically.
  • the spreader bar 34 is a profiling roll, for example of the spreader roll type, in which case, in order to work the longitudinal curling, by its means it is also easy to act upon the cross-direction curling by means of mechanical working.
  • a spreader bar 34 can be fitted at either side of the web or at both sides.
  • Fig. 6D comprises a forward dryer section D 1 with single-wire draw, in which options have been arranged for possible impingement blow devices 19A.
  • the regulation of curling has been arranged by means of steam boxes 31 and a water spray device 35 fitted in connection with the last dryer group R 23 in the after-dryer 30.
  • the after-dryer there are optional provisions for impingement blow equipments 19A.
  • Fig. 6E which is substantially similar to Fig. 6D , in view of regulation of curling, the last two groups R 22 ,R 23 in the after-dryer 30 are provided with lower support belts 33, which prevent evaporation of water, and, moreover, in connection with the last dryer group, steam boxes 31 and a water spray device 35 have been fitted.
  • the emphasis is in particular on the control of curling before the calender 40 while the web W is cool.
  • a particularly efficient combination is achieved, because, the hotter the web W is, the less readily is the steam condensed, in which connection, when cooling cylinders are used, efficient condensation of the steam is obtained.
  • the web W tends to be curled towards the side at which drying takes place last.
  • the curling can be affected at different stages in different ways so as to obtain an optimal application.
  • the exemplifying embodiment illustrated in Fig. 6A is optimal when both the forward dryer and the after-dryer D 1 ,30 are accomplished exclusively by means of dryer groups R 0 ...R 6 ,R 21 ...R 23 with single-wire draw and when the tendency of curling is controlled mainly by means of the last dryer group R 23 in the after-dryer 30.
  • a steam with a content of energy is blown out of the steam boxes 31, the superheating degree of said steam being preferably low in order that a condensation of maximal efficiency could be achieved.
  • the temperature of the steam is typically 2...10 °C above the dew point temperature. In such a case, a joint effect of moistening and thermal energy is achieved in the control of curling.
  • the steam box 31 extends substantially across the entire width of the web, and it is, of course, fitted as adjustable and as profiling.
  • the web W can be moistened so that, in the final end of the dryer section, the face(s) of one or several drying cylinders is/are moistened, for example, by means of a water atomizing device fitted preferably in connection with a doctor 14, and the water fed out of said atomizer is vaporized and enters efficiently into contact with the web by the effect of the pressure caused by the wire.
  • a water atomizing device fitted preferably in connection with a doctor 14
  • the water fed out of said atomizer is vaporized and enters efficiently into contact with the web by the effect of the pressure caused by the wire.
  • the patent FI 70,275 related to the present invention instructs to control the temperature of the drying wire so that the drying efficiency can be affected. Similarly, by means of the temperature of the drying wire it is possible to control the unequalsidedness of drying. According to the present invention, in the after-dryer there are devices by whose means the temperature of the drying wire or wires and, thereby, the curling are affected.
  • the wire can be heated, for example, by means of a steam box. For cooling, it is possible to use, for example, the methods and devices known from said FI Patent 70,275 .
  • the curling can also be controlled by adjusting the humidity and temperature of the air blown through UNORUNTM blow boxes.
  • unequalsided evaporation and curling of the web can be affected by means of the humidity of the air in the hood surrounding the web from different sides.

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  • Drying Of Solid Materials (AREA)

Claims (24)

  1. Verfahren zum Trocknen von Papier mit den folgenden Schritten:
    a) die zu trocknende Papierbahn (W) tritt von der Pressenpartie zu einer Vorwärtstrockenpartie (D1), bei der die Papierbahn (W) von der Seite ihrer Bodenfläche in Trocknergruppen (R1...RN) getrocknet wird, die einen normalen Einzelsiebzug anwenden, wobei die Vorwärtstrockenpartie (D1) ausschließlich Einzelsiebgruppen (R1...RN) mit normalem Einzelsiebzug aufweisen,
    b) von der Vorwärtstrockenpartie (D1) tritt die Papierbahn (W) zu einer Finishingpartie (D2), bei der die Papierbahn (W) mittels einer Beschichtungs-Oberflächenleim-Anlage (20) beschichtet /oberflächengeleimt wird, bei einer Nachtrockenpartie (30) getrocknet wird, bei der die Papierbahn (W) in zumindest einer Trocknergruppe (R21) getrocknet wird, die einen normalen Einzelsiebzug anwendet, wobei danach die Papierbahn (W) in einem Kalander(40) kalendriert wird und zu einer Aufrollstation (50) tritt, bei der die Papierbahn (W) zu einer Maschinenrolle (MR) aufgerollt wird, und
    c) das Rollen der Papierbahn mittels Elementen (19; 32; 33; 34; 35; 36; Dsyl; Dtela) und / oder mittels Baugruppen und Kombinationen, die aus den Elementen ausgebildet sind, und mittels zumindest einem Dampfkasten (31) zumindest in dem Bereich der Finishingpartie (D2) gesteuert wird,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren die Wirkung des Dampfkastens verstärkt wird, indem die Bahn vor dem Dampfkasten unter Verwendung eines Kühlzylinders mit einer einstellbaren Temperatur gekühlt wird.
  2. Verfahren gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren das Rollen der Papierbahn (W) mittels Aufprallblasvorrichtungen (19) beeinflusst wird, die in der Vorwärtstrockenpartie (D1) oberhalb eines Trocknungszylinders (10) / oberhalb von Trocknungszylindern angeordnet sind, wobei mittels der Vorrichtungen (19) vorzugsweise heiße feuchte Luft zu der Papierbahn (W) geblasen wird.
  3. Verfahren gemäß einem der Ansprüche 1 und 2,
    dadurch gekennzeichnet, dass
    bei dem Nachtrockner (30) das Rollen der Papierbahn (W) mittels Dampfkästen (31) gesteuert wird, wobei durch diese Einrichtungen Dampf mit einem Energiegehalt zu der Papierbahn (W) geblasen wird, die in Verbindung mit den Umkehrzylindern (12) in zumindest einer Trocknergruppe (R21, R23) mit einem Einzelsiebzug in dem Nachtrockner (30) läuft.
  4. Verfahren gemäß einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    bei dem Verfahren das Rollen der Papierbahn mittels eines unteren Stützsiebes oder -riemens (33) gesteuert wird, der in zumindest einer Trocknergruppe (R21, R22, R23) in dem Nachtrockner (30) sitzt, wobei mittels dieses Stützsiebes / Stützriemens verhindert wird, dass Feuchtigkeit von der Papierbahn (W) nach unten verdampft.
  5. Verfahren gemäß Anspruch 1,
    dadurch gekennzeichnet, dass
    bei dem Verfahren bei einem Nachtrockner (30) mit zumindest drei Trocknergruppen das Rollen der Papierbahn (W) in den letzten beiden Trocknergruppen in dem Nachtrockner (30) gesteuert wird, wobei die Gruppen als Trocknergruppen (R23, R33) eingerichtet sind, die einen Zwillingssiebzug anwenden, wobei die Papierbahn (W) sowohl von der Seite ihrer Oberfläche als auch von der Seite ihrer Bodenfläche getrocknet wird.
  6. Verfahren gemäß einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass
    bei dem Nachtrockner (30) das Rollen der Papierbahn (W) mittels einer Aufprallblasanlage (19) gesteuert wird, die oberhalb eines Trocknungszylinders (10) / oberhalb von Trocknungszylindern (10) in zumindest einer Trocknergruppe (R21, R22, R23) mit einem normalen Einzelsiebzug in dem Nachtrockner (30) angeordnet ist.
  7. Verfahren gemäß einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren das Rollen der Papierbahn (W) in den Trocknergruppen in dem Nachtrockner (30) so gesteuert wird, dass die Papierbahn (W) über derartige Trocknungszylinder (10) und Umkehrwalzen (11) geführt wird, deren Durchmesserverhältnis (Dsyl; Dtela) im Vergleich zu der Vorwärtstrockenpartie (D1) größer gestaltet ist, damit ein gleichmäßigeres Trocknen erzielt werden kann.
  8. Verfahren gemäß einem der vorherigen Ansprüche,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren das Rollen der Papierbahn beeinflusst wird, indem ein Wassernebel in Verbindung mit der Papierbahn (W) mittels einer Wasserzerstäubungsvorrichtung / mittels Wasserzerstäubungsvorrichtungen (35) in dem Nachtrockner (30) gesprüht wird.
  9. Verfahren gemäß einem der vorherigen Ansprüche,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren das Rollen der Papierbahn (W) mittels eines Durchtrocknens der Papierbahn (W) mittels eines Infrarottrockners (32) beeinflusst wird, bevor die Papierbahn (W) in den Kalander (40) tritt.
  10. Verfahren gemäß einem der vorherigen Ansprüche,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren das Rollen der Papierbahn (W) gesteuert wird, indem feuchte Luft zu der Papierbahn (W) geblasen wird, wobei die Luft vorzugsweise von der Vorwärtstrockenpartie (D1) gebracht worden ist, wobei Hauben (36) zwischenwirken, die in Verbindung mit zumindest einer Trocknergruppe (R21, R22, R23) in dem Nachtrockner angeordnet sind.
  11. Verfahren gemäß einem der vorherigen Ansprüche,
    dadurch gekennzeichnet, dass
    bei diesem Verfahren das Rollen der Papierbahn (W) mittels einer Ausstreichleiste (34) gesteuert wird, wobei durch diese Einrichtung die Papierbahn (W) mechanisch bearbeitet wird.
  12. Verfahren gemäß einem der Ansprüche 1 bis 3 oder 5 bis 11,
    dadurch gekennzeichnet, dass
    die Vorwärtstrockenpartie ausschließlich aus normalen Gruppen mit Einzelsiebzug besteht, die zu dem Boden hin offen sind, und / oder
    bei diesem Verfahren in dem Nachtrockner (30) die Papierbahn (W) im Wesentlichen ausschließlich mittels der Trocknergruppen (R21, R22, R23) mit normalem Einzelsiebzug getrocknet wird.
  13. Trockenende einer Papiermaschine mit einer Vorwärtstrockenpartie (D1) und einer Finishingpartie (D2), wobei die Finishingpartie (D2) eine Beschichtungs-Oberflächenleim-Anlage (20), einen Nachtrockner (30), einen Kalander (40) und eine Aufrollstation (50) aufweist, und das Trockenende einer Papiermaschine des weiteren Elemente (19; 32; 33; 34; 35; 36; Dsyl; Dtela) und / oder Baugruppen und Kombinationen, die aus diesen Elementen ausgebildet sind, und zumindest einen Dampfkasten (31) im Hinblick auf das Steuern des Rollens der Papierbahn (W) zumindest in dem Bereich der Finishingpartie (D2) aufweist,
    dadurch gekennzeichnet, dass
    das Trockenende einer Papiermaschine einen Kühlzylinder mit einstellbarer Temperatur zum Senken der Temperatur der Bahn (W) vor dem Dampfkasten aufweist, die Kondensation des von dem Dampfkasten gelieferten Dampf zu verstärken.
  14. Trockenende einer Papiermaschine gemäß Anspruch 13,
    dadurch gekennzeichnet, dass
    das Trockenende einer Aufprallblasanlage (19) aufweist, die in Verbindung mit zumindest einer Trocknergruppe oberhalb eines Trocknungszylinders (10) /oberhalb von Trocknungszylindern (10) in der Vorwärtstrockenpartie (D1) und / oder in dem Nachtrockner (30) sitzt.
  15. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 und 14,
    dadurch gekennzeichnet, dass
    das Trockenende zumindest einen Dampfkasten (31) aufweiset, der in dem Nachtrockner (30) sitzt, um Dampf zu der Papierbahn (W) in Verbindung mit den Gruppen (R21, R22, R23) mit Einzelsiebzug in dem Nachtrockner (30) zu blasen.
  16. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 15,
    dadurch gekennzeichnet, dass
    das Trockenende zumindest ein Stützsieb oder einen Stützriemen (33) aufweist, der in einer Trocknergruppe (R21, R22, R23) in dem Nachtrockner (30) sitzt, um zu verhindern, dass die Feuchtigkeit von der Papierbahn (W) nach unten verdampft.
  17. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 16,
    dadurch gekennzeichnet, dass
    die letzten beiden Trocknergruppen in dem Nachtrockner (30) Trocknergruppen (R32, R33) mit Zwillingssiebzug sind.
  18. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 16,
    dadurch gekennzeichnet, dass
    in dem Nachtrockner das Verhältnis (Dsyl; Dtela) des Durchmessers der Trocknungszylinder größer als das Verhältnis in der Vorwärtstrockenpartie ist.
  19. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 18,
    dadurch gekennzeichnet, dass
    das Trockenende einer Wasserzerstäubungsvorrichtung / Wasserzerstäubungsvorrichtungen (35) zum Zwecke des Sprühens von Wassernebel in Verbindung mit der Papierbahn (W) im Hinblick auf das Steuern des Rollens hat.
  20. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 19,
    dadurch gekennzeichnet, dass
    der Nachtrockner einen Infrarottrockner (32) hat, der angeordnet ist, bevor die Papierbahn in den Kalander (40) tritt.
  21. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 19,
    dadurch gekennzeichnet, dass
    das Trockenende Hauben (36) aufweist, die in Verbindung mit zumindest einer Trocknergruppe in dem Nachtrockner (30) im Hinblick auf das Blasen von feuchter Luft eingesetzt sind, die von der Vorwärtstrockenpartie (D1) zu der Papierbahn gebracht wird.
  22. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 21,
    dadurch gekennzeichnet, dass
    in dem Nachtrockner eine Ausstreichleiste (34) sitzt, um die Papierbahn mechanisch zu bearbeiten und um das Rollen der Papierbahn zu steuern.
  23. Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 16 oder 18 bis 22,
    dadurch gekennzeichnet, dass
    der Nachtrockner (30) ausschließlich Trocknergruppen (R21, R22, R23) mit einem normalen Einzelsiebzug aufweist.
  24. Verfahren gemäß einem der Ansprüche 1 bis 12 oder Trockenende einer Papiermaschine gemäß einem der Ansprüche 13 bis 23,
    dadurch gekennzeichnet, dass
    die Trockenpartie und die Hilfsvorrichtungen auf der Grundlage von in der Produktionslinie stattfindenden oder außerhalb der Produktionslinie stattfindenden Messungen des Rollens und der Qualität im Hinblick auf ein Erzielen einer optimalen Endgesamtqualität gesteuert werden.
EP97946772A 1996-12-03 1997-12-02 Verfahren zur trocknung von papier und trockenpartie einer papiermaschine Expired - Lifetime EP0943034B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI964830A FI105935B (fi) 1996-12-03 1996-12-03 Menetelmä paperin kuivaamiseksi sekä paperikoneen kuivapää
FI964830 1996-12-03
PCT/FI1997/000745 WO1998027273A1 (en) 1996-12-03 1997-12-02 Method for drying of paper and dry end of a paper machine

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EP0943034A1 EP0943034A1 (de) 1999-09-22
EP0943034B1 EP0943034B1 (de) 2002-10-23
EP0943034B2 true EP0943034B2 (de) 2008-12-03

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JP (1) JP3650131B2 (de)
KR (1) KR100391045B1 (de)
CN (1) CN1096529C (de)
AT (1) ATE226660T1 (de)
AU (1) AU5189798A (de)
BR (1) BR9713820A (de)
CA (1) CA2274228C (de)
DE (1) DE69716634T3 (de)
FI (1) FI105935B (de)
WO (1) WO1998027273A1 (de)

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CN102888777A (zh) * 2012-10-23 2013-01-23 河南江河纸业股份有限公司 高速纸机干燥部
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FR3022564B1 (fr) * 2014-06-18 2017-06-30 Allimand Procede de sechage d'une bande de papier a cigarettes et papier a cigarettes ainsi obtenu
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WO1998027273A1 (en) 1998-06-25
FI964830A (fi) 1998-06-04
CA2274228C (en) 2007-03-27
CN1239527A (zh) 1999-12-22
ATE226660T1 (de) 2002-11-15
CN1096529C (zh) 2002-12-18
EP0943034B1 (de) 2002-10-23
KR20000053015A (ko) 2000-08-25
KR100391045B1 (ko) 2003-07-12
DE69716634T2 (de) 2003-06-26
DE69716634T3 (de) 2009-07-16
DE69716634D1 (de) 2002-11-28
EP0943034A1 (de) 1999-09-22
CA2274228A1 (en) 1998-06-25
FI105935B (fi) 2000-10-31
JP2001505630A (ja) 2001-04-24
BR9713820A (pt) 2000-03-14
JP3650131B2 (ja) 2005-05-18
FI964830A0 (fi) 1996-12-03
AU5189798A (en) 1998-07-15

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